What are the default ports for FTP ( File Transfer Protocol ), Telnet, HTTP ( Hypertext transfer protocol ), NTP ( Network time protocol ), Modbus TCP Protocol.

The port numbers in the range from 0 to 1023 are the well-known ports. They are used by system processes that
provide widely used types of network services. The default ports are as below.

FTP >> Port 21

HTTP >> Port 80

Modbus TCP >> 502

NTP >> 123

Telnet >> 23